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Property, Plant and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]      
Gross Property, Plant and Equipment $ 394,341 $ 369,921  
Accumulated Depreciation and Amortization 277,031 259,524  
Property, Plant and Equipment, Net 117,310 110,397  
Depreciation expense 37,756 37,888 36,780
Land [Member]
      
Property, Plant and Equipment [Line Items]      
Gross Property, Plant and Equipment 4,384 4,308  
Buildings [Member]
      
Property, Plant and Equipment [Line Items]      
Gross Property, Plant and Equipment 79,219 74,609  
Machinery and equipment [Member]
      
Property, Plant and Equipment [Line Items]      
Gross Property, Plant and Equipment $ 310,738 $ 291,004